Another symbolical synonym of the hexagram is the dot within a circle,
as described by Freemason Albert Churchward:
Thus, if the dot in the circle is a emblematically analogous or synonymous
with the All-Seeing Eye, and if, further, the Blazing Star, Eastern Star,
or inverted pentagram signifies the All-Seeing Eye, it follows that if the
Eastern Star is synonymous with the Hexagram, then, likewise, the circled
dot is synonymous with the hexagram.
Since the hexagram's numerological signature is 6,6,6, perhaps it's true
to say that in making the Obelisk of the Washington Monument 666 feet, the
hexagram was thereby numerologically and symbolically suggested.